TY  - BOOK
AU  - Steven,D.H.
TI  - Comparative placentation: essays in structure and function 
SN  - 0126680507
PY  - 1975///
CY  - London
PB  - Academic Press
KW  - Placenta
KW  - Anatomy and histology
KW  - Physiology
N1  - Includes bibliographies and index
ER  -